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Evariste
  • Member for 7 years
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7 votes

How to evaluate $\sqrt {6\sqrt {6\sqrt{\cdots}}}$

7 votes
Accepted

The first $n$ such that $n!$ has more than or equal $10000$ trailing zeros

7 votes

Why multiplication of 142857 with 2,3,4,5,6 gives the same digits shifted?

6 votes
Accepted

Definition and ideals of $\mathbb{Z}/n\mathbb{Z}$

5 votes
Accepted

How do I show that a finite group $G$ of order $n$ is cyclic if there is at most one subgroup of order $d$ for each $d\mid n$?

5 votes
Accepted

Find the remainder of a number when divided by $9$

4 votes

How to calculate an $n$ digit decimal approximation of a fraction?

3 votes
Accepted

What is $a^{(\log_ab)^2}$?

3 votes

Show that if $a,b \in \mathbb{N}$ have remainders in the set $\{1,4\}$ after division by $5$, then so does their product.

3 votes

Two persons A and B throw a die. Who wins given the below conditions?

3 votes
Accepted

How do you evaluate the integral $\int_{0}^{\infty} \frac{x \sin x}{1+x^2} dx$?

3 votes
Accepted

FInd the missing digit in $2^{29}$ given all nine digits differ

2 votes

Remainder in this case using modular arithmetic

2 votes

Show $\int_0^\infty xe^{-ax^2}dx=\frac{1}{2a}$

2 votes

Find the maximum value of $\sqrt{x - 144} + \sqrt{722 - x}$

2 votes

Are these two scenarios equivalent ? (random walks on chessboard)

2 votes
Accepted

Brownian motions

2 votes

What is the formula to calculate the number of divisors of $n!$

2 votes
Accepted

How can I find the last digit of $17^{68}$ and the last both digits of $14^{200}$?

2 votes

Proof that $\sum_{n=1}^{\infty}2^{-3n} = \frac{1}{7}$

2 votes

If Mr. X was born on April 16, 1987 what day is 2016 days after he was born?

2 votes

Proabability of drawing a white ball

2 votes

What are the last two digits of 43^23^33?

2 votes
Accepted

Double summation to find a closed-form formula

2 votes

Prime factors of numbers of form $a^2+2b^2$

2 votes

Help proving $odd(m^2+n^2) \implies odd((m+n)^2)$

2 votes
Accepted

solve x for a cubic congruence equation with large prime mod.

1 vote

Solve $636^{369}\equiv x\pmod{126}$

1 vote
Accepted

Calculate integral with dirac comb

1 vote

How to integrate the following integral for all $q$?